Lathe-tool.



LATHB TOOL.

APPLICATION FILED Nov.17.1913.

Patented May 26, 1914.

UNITED sTATEs PATENT oEEicE.

JSEPH J'.l PACKEWITZ AND SOLOMON NUDEIMAN, 0F NEW YORK, N. Y.

nATHE-Tooi..

.application med November i7, isis. serial Naeoifsee.

To` all whom it may concern;

i l.Be it known that we, JOSEPH J. Paolinwr'rz and `SOLOMON NUDELMAN,citizens oi the United St-ates, residing at New York,

`in the county of New York and State of New" York, have invented certainnew and useful Improvements in Lathe-Tools, of

`which the following is a specification.

Our invention relates to improvements in lathe tools and is designedparticularly for the purpose of providing a simple and effective meansfor holding theftool proper or cutting member in the body ofi.tlle-kntool. This means for holding the cutter lprovides a clampingdevice having along frictional contact surface by means of whichv thecutter is held securely and rigidly in the holder, but it will beunderstood ofy course that the clamping portion of the holder in whichthe cutter is secured is yieldable with relation to the shank of thetool. r

A further meritorious feature of theinvention resides in the manner ofholding the cutter in the shank of the tool and in the position thecutter occupies in the shank so that it may be observed byanattendant,'as will be more fully described hereinafter.

The invention consists in certain novel combinations and arrangements ofparts as set forth in the following specification and claims.

In the accompanying drawings we have illustrated one complete exampleofthe phy-` sical embodiment of our invention conof Fig. 3. Fig. 5 is atransverse sectional view on line l5-5 of Fig. 3.

In the preferred embodiment of our invention we employ the standard.form of tool which involves the shank portion 1 of the tool, theclamping member or portion as the head 2, and the yielding connection orspring portion 3 which connects the clamping head with the shank, theusual p slot 4 and opening 5 being supplied to give the necessaryresiliency to the yielding arch 3. The body or shank 1. of the tool isto beclamped in the post of the lathe, or other portion of `a machinein'which it is to be used, and the cutter 6 is held in the body of thetool holder which is grooved along one of its faces for the purpose, asindicated at 7 in the shank and 8 in the clamping head of the holder.

rIhe walls of each of the grooves are undercut and the edges of thecutter are beveled-to form a dovetail connection with the walls of thegrooves. The cutter or cutting blade, it will be seen in the drawings,is a comparatively long flat steel plate, of suiiicient length toproject from the rear of the tool holder, and the forward or cutting endof the blade has a long seat between the clamping members 9 and 10 ofthe clamping head. These members are separated by a kerf or slot 11extending at right angles to the'- direction of the slot 4 and parallelwith the cutterblade. i

v I.The cutter is rigidlyT held inits head by means of the clamp bo t 12which is screwed into the threaded opening 13`of the member 10 andpassed throughI an unthreaded open.-

ing` 14 in the member 9, whilea shoulder 15 on'the bolt affords abearing on the upper face of the member 9 so that the member 10- may bedrawn Iupwardly toward the member 9 and rigidly incase and hold thecutter between the grooved portions of the members.

vIt will be understood that the blade is f clamped betweenthe twomembers 9 and 10 by turning the bolt 12 until the shoulderor ange 15bears against the upper face' of the member 9 and a continued movementof the bolt draws the member 10 toward the member 9 to clasp the cutter6 therebetween. The broad flat cutter and the comparatively .longclamping head, together provide for a rigid and secure clamping of thecutterbetween the grooved portions of the clampin head and the cutter isretained in `the hea agaist displacement of an accidental character.-

It -will be noted thatthe base line or bottom face of the member' 10 isnot .in the same plane with the base line or bottom face of the shank 1,this manner of locating the parts being for the purpose of allowing formovement of the tool without Contact with the tool post, softh-at thehead of the holder may be iexed until the lower or base line of themember 10 is brought flush `with the bottom :Eaceof the shank, thecontact of the walls of the slot 4 limiting the movement of the head.This movement of the headmay be detected by a corresponding movement ofthe rear end of the cutter or cutter blade which projects beyond theshank end, and it will be noted that the groove in the shank (8) is Wideenough to permit this movement of the blade. Thus2 while it is desirablethat the tool shall yield slightly in the direction of rotation when thepoint encounters hard steel, it is also desirable that the attendantshall be aware of the movement, and his attention will be attracted -bythe movement of the rear end of the cutte blade.

Having thus fully described our invention, what we claim is Thecombination with a shank having a groove in its face and a springclamping head having a complementary groove of less width and thebottornface of said head being in a higher plane than the bottom face ofthe` shank, of a cutter blade extended through bot-h grooves, a slot inthe head parallel with the trigger blade, and means for clamping saidblade in the cutter head.

In testimony whereof We aiix our signatures in presence of twowitnesses.

Witnesses B. J. GooDLrcH, PETER A. BREBUIS, Jr.

